<!DOCTYPE html>
<form id="test-form">
    <input type="text" name="field1" value="value1">
</form>
<script src="../include.js"></script>
<script>
    test(() => {
        const form = document.getElementById('test-form');

        form.addEventListener('formdata', (event) => {
            event.formData.append('field2', 'value2');
        });

        const formData = new FormData(form);

        println(`formData.get('field1') === 'value1': ${formData.get('field1') === 'value1'}`);
        println(`formData.get('field2') === 'value2': ${formData.get('field2') === 'value2'}`);
    });
</script>
